A wall of silence from a frightened community hampers efforts to solve a gang-related murder; a convenience-store owner is shot twice in the head.

Police try to convince the residents of a housing project to help them to track down a man who has been terrorizing the community.

A man is shot assassination-style at least 12 times; a celebrated doctor's son is murdered.

A two-timing boyfriend is shot and killed; a young father is gunned down in his doorway.

A potential witness to a double murder goes missing in Phoenix; Detroit investigators use forensics to probe the murder of a man found in a Cadillac.